Across
1
Compound containing oxygen
2
Solid with repeating atomic pattern
5
Biological catalyst
7
Icy body with a tail near the sun
10
Tectonic landmass section
Down
2
Basic unit of life
3
Absolute temperature scale unit
4
Particle of light
6
Precious yellow metallic element
8
Blocking of light by a celestial body
9
Second lightest element